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Michael….it turns out that 90.4mm is the distance to consider.
Having worked on the 73.5mm distance, I put the focuser to the estimated focal position. It was way off…..so I extended the focuser until the camera came into focus and I remember roughly what the focus position count was. Having applied the same calculations, the theoretical position taking into account 90.4mm backfocus, was very close to what the focuser count was.
cheers
Martin
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